Circular-saw mill



(No Model.)

- J 2 Sheets- -Sheet 1. O. ESPLIN.

CIRCULAR SAW MILL.

Patented A 1 1,1384.

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UNITED STATES PATENT Erica.

GHARLES ESPLIN, OF MINNEAPOLIS, MINNESOTA.

CIRCULAlR-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 295,991, dated April 1, 1884. Application filed December 10, 1883. (N model.)

To all whom it may concern:

Be it known that I, CHARLES ESPLIN, asubject of the Queen of Great Britain and Ireland, and a resident of Minneapolis, in the county of Hennepin, in the State of Minnesota, have invented certain new and useful Improvements in Circular-Saw Mills, of which the following specificationis a full, clear, and exact description, reference being also had to the accompanying drawings, in which Figure l is aside elevation. Fig. 2is a front view of a portion of the front of the upper saw-frame and swinging yoke-frame. Figs. 3, 4i, and5are detached perspective views of the rear end of the swinging yoke-frame and its supporting-bracket and the upper sawmandrel journal. Fig. 6 is a plan andpartial horizontal section of the machine. Fig. 7 is a plan view of the swinging yoke frame detached.

A is the husk or bed frame, having mount-ed thereon the lower saw-mandrel, B, lower saw, B", main driving-pulley B lumber-supporting rollers O 0 G and spreader or wedge-plate D. The husk-frame is supported loosely at its rear corners by bed-plates a a, the latter bolted or otherwise rigidly attached to the timbers or floor of the mill. The upper saw-supporting frame, consisting of side frames,E E, and cross-brace frame E is attached rigidly to the husk-frame A, upon one side only of the saw-mandrel B, the object to be hereinafter explained. By this arrangement the whole husk-frame and its attached parts may be adjusted bodilyupon the plates a a, so that after the different parts are once adjusted with reference to each other no danger exists of disarrangement by the separate adjustment of each distinct part.

Heretofore in machines of this kind the husk-frame was stationary, and the saw-mandrel B and other parts had each its own separate means of adjustment with relation to the husk-frame, and in adjusting one part it was necessary to also adjust all the other parts to correspond, which was a very laborious, uncertain, and delicate process, as a very sli ht change produced marked results in the action of the saws, and also rendered the heating of the arbor, &c., a very frequent occurrence. By my arrangement, however, after the parts are once adj ustedupon the husk-frame, no danger exists of disarrangement, as all the parts move together with the frame. It also enables the husk-frame and its attached parts to be moved bodily nearer to or farther away from the line of travel of the saw-carriage, either both ends alike or one end at a time.

Any suitable means maybe used to move the husk-frame A upon the plates a a, either levers, racks and pinions, wedges, or screws, 850.; but I prefer to use large screws F F, each journaled at one end in lugs a a upon the plates a a", and tapped through nuts a a, lying loose in sockets a a upon the huskframe A, as they not only operate easily and quickly, but firmly hold the frameA Whereever placed. The nuts or a as will be seen in Fig. 6, are formed with curved faces,so that they will roll in the sockets a a if the frame A is adjusted more at one end than the other, (which is sometimes necessary,) and thereby prevent cramping. Large bolts fitting through slots or enlarged holes in the.

husk-frame will also be used to clamp the frame to the bed-timbers after adjustment by the screws F F so, as not to depend solely upon the latter to hold the frame.

I do not wish to confine myself to any particular method of moving the husk-frame, as any well-known suitable mechanical device may be used.

The plates a a may be connected together by tie-rods, or one single frame or plate larger than the husk-frame may be used in place of the separate plates a. a

As before stated, the frame E E E, for supporting the saw, is attachedto the husk-frame uponone side onlyof the mandrel B of the lower saw, instead of upon both sides, as heretofore. This is a very important feature of my invention, as it renders the saw-mandrel and main driving-pulleys easily accessible for removal or repairs, while in machines of this kind, where the upper saw-supporting frame is arranged upon both sides of the lower sawmandrel, to remove the mandrel it is necessary to either first remove the upper frame or the main driving-pulley and the saw before the mandrel can be removed; but by the arrange ment shown no. obstruction exists above the saw-mandrel. This arrangement also greatly facilitates the oiling and-cleaning of the mandrel and the filing of the saw. It also greatly facilitates the operation of the tightener G and the placing of the upper sawdriving belt, G upon the pulleys G G G5 G, and leaves the view of the operator unobstructed, so that he can see the saws at all times. The mandrel H of the upper saw, H is journaled by its ends in a yoke-frame, H attached across the faces of the side frames, E E and adapted to be adjusted higher and lower by the screws K K and gears and pinions K as shown.

H is an arm attached to or forming part of the yoke-frame H andcarrying the sawguide H The face of the side E for about one-half its length down from the top is made concave, as shown at 6, Fig. 6, and the face of the yoke H where it comes in contact with this concave surfaceis formed correspondingly 2o convex, as shown at c the line of the center of the curve of these convex or concave surfaces running down through the center of the mandrel in one direction and through the center of the side E in the other direction, as indicated by dotted lines at a; in Fig. 7. The rear end of the mandrel H is supported by a journal-box, H, the latter resting upon the flat end H of the yoke-frame. This fiat end in turn rests upon a bracket, H adapted to be moved up and down along the face of the side frame, E, by the screw K as before described. The bracket H and also the convex end 6 of the yoke-frame H, are bolted to the side frames, E E, by bolts g 9 fitting through slots y y in the side frames, so that the yokeframe may be firmly attached to the side frames, while at the same time, by means of the slots, it is left free to be adjusted higher and lower by the screws K K By loosening or tightening one of the set-screws which hold the pinions K to their shaft the screws K K may be operated together or separately to adjust one or both ends of the mandrel H.

m is a screw j ournaledin a lug, m, upon the outer corner of the bracket H and tapped through a lug, m upon the outer end of the flat part H of the yoke-frame H by which means the rear end of the yoke-frame may be adjusted nearer to or farther away from the side E and thereby swing the yoke-frame upon the convex and concave surfaces 0 e as a center, and adjust or line the upper saw, H, to any required extent, the curved surfaces 6 e? permitting this swinging movement without danger of cramping or straining the parts.

m* is another screw,similar to the screw m, journaled in a lug, m, on the end H of the yoke-frame H, and tapped into the lower section of the journal-box H, by which means the journal-box may be adjusted along the end H in a line parallel with the mandrel H, and carrying the mandrel with it. This mandrel H is provided with a shoulder at n in front of, and a collar, n", Fig. 6, in the rear of, the 65 j ournal-box, so that the mandrel will be moved endwise with the journal-box when the latter is adjusted by the screw m. By this simple arrangement the upper mandrel, H, may be easily and quickly adjusted in all directions by merely turning the two screws m and W. Bolts 1- 1 will be arranged to clamp the journal-box H to end H, and to also clamp the latter to the bracket H after the mandrel and saw is adjusted, so as not to depend wholly up on the screws m m to hold the parts in place.

' Having described my invention and set forth its merits, what I claim is- I 1. In a circular-saw mill, the combination of the laterally adjustable husk frame A, supporting the saw or saws B H, stationary bed-plates a a, on which the said husk-frame is supported, and by which it is held in position, and means for laterally adjusting the said frame upon the said bed-plates, substantially as and for the purpose herein specified.

2. The combination of the laterally-adj ustable husk-frame A, having the mandrel B, saw B lumber-supporting rollers G O 0 and wedge-plate D, mounted thereon, stationary bed-plates a a, on which the said husk-frame is supported and by which it is held in position,and means for laterally adjusting the said frame upon the said bed-plates, substantially as and for the purpose herein specified.

3. The combination of the laterally-movable husk-frame A, having the mandrel B, saw B lumber-supporting rollers G O O,wedge-plate D, and upper saw-supporting frame, E E E mounted thereon, stationary bed-plates a a, on which the said husk-frame is supported and by which it is held in position, adj listing-screws F F", nuts to a and sockets a a, substantially as and for the purpose herein specified.

4.. In a circular-saw mill, the combination of the husk-frame A, carrying the lower saw, B the upper saw-supporting frame, E E E mounted on the husk-frame, fixed bed-plates a a and frame-adjusting screws E E substantially as herein specified.

5. In a circular-saw mill, the combination of the husk-frame A,carrying the mandrel B, saw B and driving-pulley B and the upper saw-supporting frame, E E Eflattaehed to the said husk-frame, located entirely at one side of the said mandrel B, substantially as and for the purpose herein specified.

6. In a circular-saw mill, the combination of the husk-frame A, carrying the lower mandrel, B, saw B", and saw-driving pulley B, the upper saw-supporting frame, E E E ,theyoke- 1 20 frame H, carrying the upper saw-mandrel, H, and adapted to swing laterally and vertically around the center of one mandrel-bearing,and means, substantially as described, for adjusting it at the other mandrel-bearing both hori- I2 5 zontally and vertically, for the purpose herein specified.

7. In a circular-saw mill, the husk-frame A, carrying the lower saw, upper saw-frame having concave face 6, yoke-frame H carrying 130 the upper saw-mandrel and saw, and having convex face 6, and means for adjusting said yoke-frame, substantially as shown.

8. The combination of the frame E E E 5 substantially as specified.

295.9911 a v p 2 having concave face 6, yoke-frame H carryhaving the concave face 6, yoke-frame H ,hav-

ing the upper saw-mandrel, H, and having ing convex face 6, and carrying the mandrel convex face 6 journal-box H bracket Hiand H and saw H journal-'box H, bracket H, I 5 means for adjusting said yoke and mandrel and screws K K substantially as and for the purpose specified.

9. The combination of the frame E E E, In testimony whereof Ihave hereunto set my having the concaveface e, yoke-frameH havhand in presence of two subscribing witnesses.

ing convex face e guide-arm H, guide H mandrel H, saw H journal-box H, bracket 10 H and means for adjusting said yoke-frame,

substantially as described.

10. The combination of the frame E E E,

CHARLES ESPLIN.

Witnesses: JOHN METHLEY, GHAs. N. WOODWARD. 

